Windows Phone 8.1 (WinRT, Universal Apps) Mobile Services - Important Snippet to avoid Exceptions if the user cancels the login

Mobile Services 8.1 Snippet

 protected override void OnActivated(IActivatedEventArgs args)
        {
            base.OnActivated(args);

#if WINDOWS_PHONE_APP
            if (args.Kind == ActivationKind.WebAuthenticationBrokerContinuation)
            {
                App.<mobileservice>.LoginComplete(args as WebAuthenticationBrokerContinuationEventArgs);
            }
#endif
        }